Valve grinding tool



M r 9 J. DROHAN 1,994,98

VALVE GRINDING TOOL Filed Julie '7, 1934 j M81110 2? Z I James Jlirohan,

Patented Mar. 19, 1935 UNITED if- E ntrast- OFFICE VALVE GRINDING TOOL James J. Drohan, York Village, Maine, assignor to George Erickson, Everett, Mass.

Application June 7. issi senaino. 729,430 1 Claims; (01.51 1 5) The present invention relates to valve grinding tools and particularly to devices for grinding the valve seats of internal combustion engines, the

main object of the invention being the produc-' Another objector the invention is the mounting of the tool on the pilot in such manner that the tool may be "rotated without rotating the pilot.

illustrated in the accompanying drawing.

For the purpose of, illustrating the invention,

one preferred form thereof is illustrated in the drawing, this form having been found to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which the invention consists can be variously arranged and organized, and the invention is not limited to the'preoise arrangement and organization of these instrumentalities as herein shown 'I and described except as required by the scope of the appended claims.

Of therdrawing Figure 1 represents an elevation of a valve grinding device embodying the principles of the present invention.

Figure 2 represents a plan tool.

Figure 3 represents an inverted plan of the same. i s

Figure 4 represents an elevation of the same.

Figure 5 represents a vertical section of same on line 5, 5, on Fig. 2.

Fi ure 6 represents an elevation of the upper 40 end of the pilot for said tool.

Figure '7 represents a plan of the grinding element used on said tool.

Figure 8 represents an elevation of same.

Figure 9 represents an elevation of same shaped for use on said tool, and

Figure 10 represents a vertical section of an- I other form of tool having a tapered bore to fit a tapered pilot.

Similar characters indicate like parts throughout the several figures oi the drawing.

In the drawing, 10 is a pilot, the diameter of which conforms tothe cylindrical opening in the engine in which normally is disposed the stem of a valve which obviously is removed before the valve seat is ground. 7

of the grinding These objects'are obtained by the mechanism .rundum, as shown in Figs. 7 and 8.

The pilot 10 has a head ll which is fitted to a cylindrical chamber 12 in a disk 13. This disk 13 preferably'hasa threadedhub 14 extending upwardly therefrom adapted to receive the threaded end '15 of a spindle 16-which may be .5-

rotated by any well known mechanism.

'The pilot 10 fits theopening 17 in the disk 13' making it possible 'to' rotate said disk' 13 without rotating said pilot.

This is a great advantage as there will be no 10 danger of injuririgthe pilot 10'and the wall of the'valve stem opening even if any grit should get in said opening as the pilot would remain stationary while the disk" rotates.

If desired, the pilot may have a tapered portion fitting the tapered bore 18 of the disk 13-,ias shown in Fig-10, in which case the disk 13 would rotate with the pilot when the latter is rotated about its axis-by the usual driving mechanism.

The disk 13 has a plurality of channels 19 20 formed therein and between these channels 19 are' T-shaped ribs 20 having oppositely disposed grooves 21 at the bases thereof.

The outer surfaces of saidribs 20 are inclined at'an angle of 45 asindicated at '22 and in cross 25 section theouter surfaces of thes'e ribs cylindricalas indicated at 23. d j

' The grinding element-24 is made from a strip of cloth or similar material covered with carbo- The opposite shorteredges of these elements 24' have metal clips 25 thereon the thickness of which is slightly greater than the grooves 21.

These elements 24 are bent into the form shown in Fig. 9 and when thus formed may be mounted on the ribs 20 with the clips 25 tightly fitting the grooves 21. 7

When the grinding elements 24 are thus positioned they will remain in place during the grinding operation. v I

As the lower portions of the grinding elements 24 become worn and inoperative the operator may are semimove these elements 24 along the ribs 20 until new grinding surfaces are in position forthe proper grinding of the valve seat. The elements may be moved in this manner f as often as is required until the entire grinding surfaces are worn to such an extent as to be of no further use and then new grinding elements 24 are substituted for the worn elements.

the grinding elements may be adjusted endwise of the ribs 20 but other means may beemployed' if desired without affecting the principles of the invention. 7 I 55 One means is shown in the drawing whereby,

When the elements 24 are to be positioned on the ribs the cloth in the clips 25 may be compressed sufficiently to permit the insertion of the clips 25 into the grooves 21.

The grinding elements 24 may be positioned on the ribs 20 and removed therefrom without removing the disk 13 from the pilot 10.

By thus mounting the grinding elements 24 on the ribs 20 the grinding surfaces are always outside of the boundaries of the disk 13 making it impossible for the valve seat to be injuredby coming into contact with sharp corners of the disk 13. I V

carborundum is the best abrasive to be used on the elements 24, but obviously other abrasives may be utilized to advantage in some cases.

The carborundum on the elements 24 will cut into any material such as hard carbon or any metal in which the valve seat is formed.

The grinding tool is inexpensive to make and is most efficient in operation. g

It is believed that the operation and many advantages of the invention will be understood without further description.

Having thus described my invention, I claim:

1. The combination of a pilot; a disk mounted thereon having a pluralityof ribs provided with broad inclined outer surfaces forming'concentric sections of a cone; abrasive elements extending over and adjustable endwise of said outer surfaces; and means for rotating said disk. r

2. The combination of a pilot; adisk mounted thereon having a plurality of ribs provided with broad inclined outer surfaces forming concentric sections of a cone; abrasive elements extending over and adjustable endwise of said outer surfaces; and means for rotating said disk independently of said pilot.

3. The combination of a pilot provided with an enlarged cylindrical head; a disk mounted thereon having a plurality of ribs with broad inclined outer surfaces forming concentric sections of a cone and provided with a chamber to receive said cylindrical heady-abrasive elements extending over and adjustable endwise of said outer surfaces; and-means for rotating said disk.

4. The combination of a pilot; a disk provided with a threaded hub and having a plurality of ribs with broad inclined outer surfaces forming concentric sections of a cone; abrasive elements extending over and adjustable endwise of said outer surfaces; and means threaded to said hub for rotating said disk.

5. The combination of a rotatable disk provided with a plurality of T-shaped ribs, the outer surfaces of which are broad and inclined forming concentric sections of a cone; and abrasive elements frictionally mounted .on said ribs and adjustable endwise of said inclined surfaces, said elements extending the full width of said ribs.

6. The combination of a rotatable disk provided with a plurality of ribs the outer surfaces of which are broad and inclined forming concentric sections of a cone, said ribs having oppositely disposed inclined grooves at the bases thereof yandabrasive elements adjustable endwise of said inclined surfaces with their opposite ends frictionally held in said grooves.

7; The combination of av rotatable disk provided with a plurality of ribs the outer surfaces of which are broad and inclined, said ribs having oppositely disposed inclined grooves at the bases thereof; and abrasive elements disposed on said ribs and provided at opposite ends with metal clips adjustable endwise of said'grooves.

8. The combination of a rotatable disk provided with a plurality of inclined ribs having broad concentric faces; and abrasive elements frictionally positioned on said ribs and adjustable endwise thereof, said elements extending over the entire width of said broad faces.

9. The combination of a rotatable frusto-conical disk having channels therein forming a plu-' rality of inclined ribs with broad concentric faces; and abrasive elements frictionally posie tioned on the faces of said ribs and, adjustable endwise thereof;

10. The combination of a rotatable frustoconical disk having channels therein forming a plurality of inclined ribs with broad concentric faces and grooves in the side walls thereof; and abrasive elements frictionally positioned on the faces of said ribs andadjustable endwise thereof, said elements having reenforced ends disposed in said grooves. V

' JAMES JpDROHAN. 

